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Lenovo's IdeaCentre B520 is one of the first all-in-one desktops we've seen with a built-in 3D display. While we're not crazy about the idea of 3D viewing in general, building the technology into an all-in-one makes a lot of sense. A lower-midrange graphics card prevents this system from excelling as a gaming system, but in broad multimedia terms, the IdeaCentre B520 is as complete as we expect for $1,279. We don't recommend this PC to everyone, but if you're interested in a self-contained, 3D-capable entertainment desktop, the Lenovo IdeaCentre B520 is a remarkable deal.

One of the more stylized all-in-ones on the market, the IdeaCentre B520 looks the part of a specialized computer with its angled edges. The 23-inch, 1,920x1,080-pixel-resolution touch screen is large enough that you can watch movies from a moderate distance, and Lenovo includes a remote control that helps you navigate as you would with a traditional home entertainment component.

For 3D output, Lenovo relies on Nvidia's 3D Vision technology, facilitated here by the Nvidia GeForce GT 555M graphics card and a set of Nvidia's active 3D glasses. The glasses charge via an included Micro-USB cable, although unlike with the standard desktop version of 3D Vision, you don't have to deal with a separate 3D emitter device, since it's built into the IdeaCentre's chassis. Although we're ambivalent about 3D viewing, this system demonstrates how all-in-one desktops make a more compelling case for desktop 3D by offering the clutter-minimizing opportunity to integrate the emitter.

Equipped with 3D Vision, the IdeaCentre B520 lets you play games and view photos and Blu-ray movies in 3D. Enabling 3D viewing isn't as easy as it should be. You need to either click the specific enable/disable icons buried in the Nvidia Start menu folder, or know to go into the graphics driver software. Neither will stump savvier users for long, but with all of the bundled application icons Lenovo crammed onto this system's desktop screen, it seems remiss that Lenovo didn't also come up with an icon for toggling the 3D.

We had both good and bad experiences with the IdeaCentre's 3D functionality. 3D quality in movies largely depends on the way it's implemented in production, but for movies in which the makers used 3D to good effect, the Lenovo's 3D output was crisp and engaging. For games that explicitly support Nvidia's implementation of 3D, such as Metro 2033, the experience can be enjoyable, but for others, like the AMD 3D-designed Deus Ex: Human Revolution, the 3D effects look disjointed. This is more a function of game development choices than a failure on the part of Lenovo, but the fact is that not every game will look great in 3D on the IdeaCentre B520. As you'll see in our performance discussion, the quality of the 3D experience is only one concern we have about this system's gaming capabilities.

Even if you're not sold on the 3D concept, it's hard to argue against the IdeaCentre B520's value. Sony is one of the few other vendors with a competing 3D-equipped all-in-one, but the $2,499 L-Series Signature Edition costs nearly twice as much as Lenovo's offering, and the two are essentially identical in terms of their features. Sony can boast a larger hard drive and a slightly larger display, but Lenovo offers a faster CPU and a faster graphics card, both of which help make it a more complete computer. You can buy a more affordable Vaio 3D L-Series all-in-one from Sony, but you cannot match the components in the IdeaCentre B520 without spending more than $2,400.

We also like that the IdeaCentre B520 is a stellar performer among higher-end all-in-ones. It's a better Photoshop system than the Sony or either of Apple's most recent iMacs. It also has the best raw multicore performance. An iMac will make a better audio encoding system, at least in iTunes, but not by that much. And while you might have other reasons for favoring an OS X or a Windows 7 system, among Windows PCs, the Lenovo is the clear performance leader compared with the Sony that costs nearly twice as much.

We took a different approach with game testing on these systems than we usually do so that we could account for the 3D capability. We focused solely on old, forgiving Far Cry 2, since we knew it would give these systems a reasonable challenge without bogging them down to the point of irrelevance. First, the Lenovo is faster than the Sony system on every test run. But also note that with 3D turned on, you lose about half your frame rate. The results aren't limited to one resolution, either, so you can't blame memory bottlenecking or any issue other than raw graphics processing capability. The Far Cry 2 scores combined with the more challenging 3DMark 11 test suggest that the Lenovo is only an adequate gaming desktop at best, and that's without 3D enabled. Turn 3D on, and overall performance suffers dramatically.

This is not to say that the Lenovo can't handle more modern games. With 3D off, it was able to play Deus Ex: Human Revolution smoothly, although we ran into some chugging at maximum image quality. In all, the IdeaCentre B520 is a respectable gaming desktop. You can expect it will play some games in 3D and with decent image quality well, but we can't guarantee a smooth 3D gameplay experience with every title. Even without 3D enabled, you may also have to be conservative with the image quality settings on more challenging games.